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List:       kde-devel
Subject:    Re: Customerize printing
From:       Michael Goffioul <goffioul () imec ! be>
Date:       2003-09-01 8:30:54
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> The basic rendering in Qt / KDE exists in the form of a QPainter /
> QPaintDevice framework.
> The KPrinter is a special QPaintDevice, like QWidget, QPrinter a.s.o. It is
> used to proxy to multiple
> printing queues, like LPng, CUPS a.s.o. Internally it uses an hard-coded
> Postscript generating paint device.
> 
> So in order to integrate your PDF code generator, I suppose you have the
> following options:
> 
> - implement a pure PaintDevice (inherit from QPaintDevice and wire the
> operator implementations)
>   Doing so would require application developers to explicitly call their
> renderings with your paint device. I suppose
>   this could be done via a standard action in an application GUI?
> 
> - make the generator in KPrinter changeable and provide your PDF generator
> as some kind of special printer
>   queue. This would involve changing KPrinter source code, I suppose.

As explained, you need a QPaintDevice implementation that produces
PDF code in the QPaintDevice::cmd function. Plugging this into kdeprint
needs some code arrangment, but not that much, as the KPrinter object
redirect all the drawing commands to an internally created QPrinter
used simply as a PS generator. So it's only a matter of replacing that
internal code generator.
So if you come with a fully-featured QPDFPrinter class (inheriting
from QPaintDevice), then integration should be pretty easy. But the
main point IMO is then to define a common printing interface that
a potential backend would implement.

Michael.

> 
> Hope this helps,
> 
> Regards
> Dirk
> 
> 
>  
> 
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Michael Goffioul		IMEC-DESICS-MIRA
e-mail: goffioul@imec.be	(Mixed-Signal and RF Applications)
Tel:    +32/16/28-8510		Kapeldreef, 75
Fax:    +32/16/28-1515		3001 HEVERLEE, BELGIUM
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